Leviticus 26:36-37

36“ ‘As for those of you who are left, I will make their hearts so fearful in the lands of their enemies that the sound of a windblown leaf will put them to flight. They will run as though fleeing from the sword, and they will fall, even though no one is pursuing them.

37They will stumble over one another as though fleeing from the sword, even though no one is pursuing them. So you will not be able to stand before your enemies.